EP0720909B1 - Procédé et dispositif pour fabriquer un tuyau coudé en caoutchouc - Google Patents

Procédé et dispositif pour fabriquer un tuyau coudé en caoutchouc Download PDF

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Publication number
EP0720909B1
EP0720909B1 EP96200510A EP96200510A EP0720909B1 EP 0720909 B1 EP0720909 B1 EP 0720909B1 EP 96200510 A EP96200510 A EP 96200510A EP 96200510 A EP96200510 A EP 96200510A EP 0720909 B1 EP0720909 B1 EP 0720909B1
Authority
EP
European Patent Office
Prior art keywords
rubber pipe
bent rubber
bent
mandrel
gripping member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96200510A
Other languages
German (de)
English (en)
Other versions
EP0720909A2 (fr
EP0720909A3 (fr
Inventor
Shinya Matsuda
Kohji Chida
Shigeki Toyoda
Hiroyuki Awaji
Tetsuo Hasegawa
Kenji Shimizu
Seishiroh Sugie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yamashita Rubber Co Ltd
Original Assignee
Yamashita Rubber Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP4283711A external-priority patent/JP2775128B2/ja
Priority claimed from JP28371392A external-priority patent/JP2651978B2/ja
Priority claimed from JP4283714A external-priority patent/JP2777621B2/ja
Priority claimed from JP4283712A external-priority patent/JP2891597B2/ja
Application filed by Yamashita Rubber Co Ltd filed Critical Yamashita Rubber Co Ltd
Publication of EP0720909A2 publication Critical patent/EP0720909A2/fr
Publication of EP0720909A3 publication Critical patent/EP0720909A3/fr
Application granted granted Critical
Publication of EP0720909B1 publication Critical patent/EP0720909B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C31/00—Handling, e.g. feeding of the material to be shaped, storage of plastics material before moulding; Automation, i.e. automated handling lines in plastics processing plants, e.g. using manipulators or robots
    • B29C31/002—Handling tubes, e.g. transferring between shaping stations, loading on mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/58—Applying the releasing agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0003—Discharging moulded articles from the mould
    • B29C37/0017—Discharging moulded articles from the mould by stripping articles from mould cores
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
    • B29C53/02—Bending or folding
    • B29C53/08—Bending or folding of tubes or other profiled members
    • B29C53/083—Bending or folding of tubes or other profiled members bending longitudinally, i.e. modifying the curvature of the tube axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
    • B29K2105/243—Partially cured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
    • B29K2105/246—Uncured, e.g. green
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/004—Bent tubes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53796—Puller or pusher means, contained force multiplying operator
    • Y10T29/53848—Puller or pusher means, contained force multiplying operator having screw operator
    • Y10T29/53857—Central screw, work-engagers around screw
    • Y10T29/53861—Work-engager arms along or parallel to screw
    • Y10T29/53874—Pivotal grippers on screw
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/53987—Tube, sleeve or ferrule

Definitions

  • the present invention relates to a device for use in manufacturing a bent rubber pipe.
  • a fitting step for placing a straight pipe-like moulding material (hereinafter referred to as a semi-finished rubber product) of an unvulcanised or semi-vulcanised rubber on a curved mandrel a vulcanizing step for forming a rubber pipe fixed in a curved shape by heating and vulcanizing the semi-finished rubber product in a condition fitted on the mandrel, and an extracting step for removing the vulcanized rubber pipe from the mandrel.
  • a process of this type is shown in DE 2140956 (Phoenix Kunststoffwerke AG).
  • the extracting step is normally effected by a manual operation which must be carried out immediately after vulcanization in order to handle the pipe at a condition of high temperature, so as to lessen the extracting load when the bent rubber pipe is removed from the mandrel. For this reason, the operation must be performed in a very difficult operating environment having high temperature and high humidity. Thus, it is necessary to take relatively frequent rest periods and also it is difficult to increase operating efficiency.
  • GB 1048788 An alternative method of removing the pipe is disclosed in GB 1048788 (Goodyear).
  • one end of a hose formed on a flexible mandrel is gripped by a clamp.
  • a nozzle attached to the clamp then forces pressurized water into the hose to remove the mandrel.
  • a device for manufacturing a bent rubber pipe characterized in that a gripping member is provided to freely advance and retract on an extension of an axis of the bent rubber pipe in order to grip one end portion thereof fitted on a mandrel, in that the gripping member is provided with a plurality of moveable pawls for gripping the bent rubber pipe at equidistant positions about said periphery, each pawl being biassed radially inwardly with respect to the pipe by a spring, in that each pawl is formed with a sawtooth-like tooth portion which is capable of contacting with the bent rubber pipe and the teeth of which are inclined to an extracting direction, in that a diameter of a face circle formed by joining the circumferentially adjacent tooth portions of the pawls is smaller than an outer diameter of the bent rubber pipe, and in that the gripping member is arranged to receive the bent rubber pipe and to perform a biting action in which the tooth portions bite into the periphery of the bent rubber pipe in a condition grip
  • the device for manufacturing a bent rubber pipe set forth in claim 1 is characterized in that each pawl is rotatably supported by a supporting shaft extending in a direction transverse to the axis of the mandrel, and wherein in order to receive the bent rubber pipe in the gripping member, the face circle is expandable at least as much as the outer diameter of the bent rubber pipe, by rotation of each pawl in a retraction direction so that the tooth portion thereof can pass over the periphery of the bent rubber pipe.
  • the device for manufacturing a bent rubber pipe set forth in claim 2 is characterized in that each pawl is rotatable by means of a spring in a biting direction of the tooth portion.
  • the device for manufacturing a bent rubber pipe set forth in any of claims 1 to 3 is characterized in that an aligning guide is arranged at the mandrel side of the gripping member, and wherein the aligning guide is provided with a guide bore which is concentric with the face circle and which is capable of receiving the bent rubber pipe therethrough, and a guide surface inclined to the extracting direction toward the guide bore.
  • the gripping member is provided with a plurality of pawls which are equidistant in the peripheral direction of the bent rubber pipe, the periphery of the end of the bent rubber pipe can be gripped with the uniform force and it can be extracted without being flattened.
  • the face circle is smaller than an outer diameter of the bent rubber pipe, but when the end of the bent rubber pipe is gripped, it is possible to perform a gripping action which runs on the periphery of the bent rubber pipe, and moreover, when extracting, the bent rubber pipe can be exactly extracted by the biting action.
  • the extracting operation can be effected by machines without using hands, the operator is released from the severe operating environment, and since the relatively frequent rest times are unnecessary, it is possible to shorten the shaping cycle and to improve the operating efficiency, as well as it is possible to attain the performance of bulk production and the automation.
  • the pawl is rotatable by the supporting shaft extending in a direction intersectional to the axis of the bent rubber pipe, when the end portion of the bent rubber pipe is gripped the pawl rotates in the escaping direction and can run easily on the end portion of the bent rubber pipe, whereby it can attain the smooth gripping action.
  • Figure 1 is a view showing the principles of operation during a fitting step, a vulcanizing step and an extracting step in a method of manufacturing a bent rubber pipe in sequential manner.
  • the stages A, B, C show a fitting step, stage D a vulcanizing step, and stages E, F an extracting step. Further, the outline shown in the F stage is a cross sectional form of a bent rubber pipe 1 being a finished article. This bent rubber pipe is bent three-dimensionally.
  • the fitting step stage A shows a condition in which mandrel 2, a guide member 3 and a semi-finished rubber product 4 are arranged on the same axis.
  • the mandrel 2 is cantilevered on a mandrel base, and is bent in the same shape as that desired for the bent rubber pipe 1 (F stage).
  • the mandrel 2 is provided with a base portion 2a and a free end 2b, and the straight pipe-like guide member 3 is arranged adjacent to an axis of the mandrel and the free end 2b on the same axis.
  • the semi-finished rubber product 4 having a substantially straight pipe shape, which is supported to freely displace in the lengthwise direction of the guide member 3.
  • EPT EPT
  • NBR NBR
  • PVC copolymer SBR
  • CR CR
  • NR any other suitable rubber materials or blends of those suitably combined, or blends of a suitable material among them and another material, if necessary, a material including short fibres kneaded into rubber, a material including reinforced yarn or woven textile, a material having a surface knitted with reinforced yarn, or the like.
  • a nozzle 5 is inserted inside the semi-finished rubber product 4 before fitting the latter, and is adapted to advance and retract in an axial direction of the semi-finished rubber product whilst discharging die lubricant, whereby the die lubricant is applied to the inner surface of the semi-finished rubber product 4.
  • an arm 6 constituting part of a pushing device is pushed into the guide member 3 from an end opposite to the mandrel 2, and a head 7 which has a size generally equal to the inner diameter of the guide member 3, mounted on a leading end of the arm 6 is abutted to one end of the semi-finished rubber product 4, whereby the latter is pushed out of the end of the mandrel 2.
  • the semi-finished rubber product 4 is pushed on to the mandrel 2 so as to cover it, easily bending in order to do so. It does not however tend to buckle in front of the mandrel 2 because the semi-finished rubber product is guided at its periphery by the straight pipe-like guide member 3 together with the mandrel 2 on the same axis. The product 4 is then pushed out laterally as it approaches the base portion 2a by the bent part of the mandrel 2.
  • the C stage is a condition in which the fitting of the semi-finished rubber product has been completed, and the semi-finished rubber product 4 is fitted on the periphery of the mandrel and is curved in the same shape as the mandrel. Simultaneously, the arm 6 and head 7 are retracted from the inside of the guide member 3 to outside thereof.
  • the D stage is the vulcanizing step, and the semi-finished rubber product is moved into a vulcanizing device 8 in its condition fitted on the mandrel 2, and is vulcanized by heating at a required temperature, pressure and time thereby to form the bent rubber pipe 1 fixed with the same shape as the mandrel 2.
  • one end of the bent rubber pipe 1 taken out from the vulcanizing device 8 after vulcanizing is gripped by means of a gripping member 10, and thereafter, an arm 11 of a plunger mounting the gripping member 10 on a leading end thereof is retracted along the axis of the mandrel 2, whereby the bent rubber pipe 1 is extracted from the mandrel 2.
  • the bent rubber pipe 1 is extracted in the axial direction of the mandrel 2 whilst deforming according to curves of the latter.
  • the bent rubber pipe is at a relatively high temperature immediately after vulcanizing, this tends to reduce the extraction load and smooth operation can be attained.
  • the F stage shows the bent rubber pipe 1 thus extracted and removed from the mandrel 2 and the bent rubber pipe 1 is restored to the required bent shape corresponding to the mandrel 2.
  • Figure 2 is a view showing a device for the extracting step, and shows stage E of Figure 1 being the extracting step in a condition enlarged and more detailed.
  • Figure 3 is a cross sectional view taken along line X-X in Figure 2.
  • a plurality of pawls 112 are rotatably mounted by respective supporting pins 113 each extending in a direction transverse to the axis of the mandrel 2.
  • Each supporting pin 113 is mounted on a leading end of an arm 115 which is bent from a bracket 114 provided on a leading end of the arm 11.
  • On the pawls are formed saw tooth-like tooth portions 116 which are rotated and energized in a direction biting in the outer periphery of the bent rubber pipe 1 by means of a compression spring 117 tensed between the pawl 112 and the arm portion 115.
  • a stopper 118 which limits the rotating amount of the pawl 112 is provided on the arm 115 in a position abutting a shoulder portion of the pawl 112.
  • the pawls 112 are provided at positions dividing the periphery of the bent rubber pipe 1 into substantially four equal length portions and a face circle formed by joining the leading ends of each tooth portion 116 is adapted to be smaller than the outer periphery of the bent rubber pipe 1 (see Figure 4). Accordingly, the tooth portions 116 of the pawls 112 are able to grip the periphery of the bent rubber pipe 1 with substantially unified force.
  • Four pawls 112 need not necessarily be provided and in general it is possible to provide three or more pawls.
  • Figures 4 to 6 are enlarged views showing different operating conditions of the parts of the gripping member 10.
  • Figure 4 shows a condition before gripping the bent rubber pipe 1 after starting the extracting step, the pawl 112 being energized by means of the spring 117 to rotate in a clock wise direction around the supporting pin 113, as well as the shoulder 119 abutting the stopper 118 to stop the tooth portion 116 at a position at which it extends by a dimension "d" into the end projection of the outer periphery of the bent rubber pipe 1.
  • the gripping member 10 is displaced in the direction of the free end 2b of the mandrel 2
  • the gripping action is performed.
  • the tooth portion 116 firstly contacts the leading end of the bent rubber pipe 1.
  • the pawl 112 is pushed by the bent rubber pipe 1 and causes the spring 117 to compress against the action of the latter, whereby the pawl rotates to retract in a counter clockwise direction.
  • the pawl 112 runs along the outer periphery of the bent rubber pipe 1 with frictional contact by the tooth portion 116. At this time, since the latter is inclined in the extracting direction, the rotation of the pawl 112 in the retraction direction can occur.
  • the pawl 112 rotates in the opposite direction to the retraction direction, that is, in a biting direction being the clockwise direction in Figure 6 under the restoring resiliency of the spring 117, whereby the tooth portions 116 bite into the outer periphery of the bent rubber pipe 1 and the substantially unified force grips the periphery. Then, as shown in Figure 6, when the gripping member 10 is displaced in the extracting direction, the tooth portions 116 bite into the periphery of the bent rubber pipe 1, and the latter moves in the extracting direction integrally with the gripping member 10, and is extracted from the mandrel 2.
  • the end of the bent rubber pipe 1 is gripped at the periphery thereof with the unified force and it can be extracted without deforming or tending to be flattened. Further, since the tooth portion 116 has a saw tooth shape inclined in the extracting direction, the extracting action tends to increase the biting into the periphery of the bent rubber pipe 1, so that it is possible to extract positively.
  • the extracting step is performed at a high temperature condition immediately after vulcanizing the bent rubber pipe 1 in order to lessen the extracting load, because the operation is performed by a machine, it is unnecessary for an operator to work under severe conditions of high temperature and high humidity, as in the case of a manual extraction operation.
  • FIG 7 is an enlarged view showing the gripping member 10 according to a further embodiment relating to the extracting step.
  • the gripping member 10 is identical to the embodiment described with reference to Figures 2 to 6, and an aligning guide 125 is provided between the free end 2b of the mandrel 2 and the gripping member 10.
  • the aligning guide 125 is a disc-like member concentric with them, and has a central guide opening 126 with an inner diameter substantially identical to the outer diameter of the bent rubber pipe 1.
  • the aligning guide is united with the gripping member 10 by mounting on the side of the bracket 114 so as to become concentric with the face circle of the tooth portion 116 of the pawl 112.
  • a guide slant surface 127 which is directed in a centre direction at a periphery of the guide opening 126 and which inclines in the extracting direction.
  • the guide slant surface 127 of the aligning guide 125 contacts the leading end (adjacent the free end 2b side) of the bent rubber pipe 1, and moves in a direction transverse to the axis whilst sliding along the leading end of the bent rubber pipe 1 so as to allow the leading end of the latter to coincide with the guide opening 126, so that the aligning guide 125 aligns the gripping member with the pipe 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Robotics (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)

Claims (4)

  1. Dispositif pour fabriquer un tuyau coudé en caoutchouc (1), caractérisé en ce qu'un élément de préhension (10) est prévu pour avancer et se rétracter librement sur un prolongement d'un axe du tuyau coudé en caoutchouc (1) afin de saisir une extrémité de celui-ci monté sur un mandrin (2), en ce que l'élément de préhension (10) est muni d'une pluralité de cliquets déplaçables (112) pour saisir le tuyau coudé en caoutchouc à des emplacements équidistants sur sa périphérie, chaque cliquet étant sollicité radialement par un ressort (117) vers l'intérieur par rapport au tuyau, en ce que chaque cliquet est formé avec une partie dentée (116) similaire à des dents de scie, qui est capable de venir en contact avec le tuyau coudé en caoutchouc (1) et dont les dents sont inclinées vers une direction d'extraction, en ce qu'un diamètre d'un cercle de face formé en reliant les parties dentées circonférentiellement adjacentes des cliquets est plus petit qu'un diamètre extérieur du tuyau coudé en caoutchouc, et en ce que l'élément de préhension (10) est agencé pour recevoir le tuyau coudé en caoutchouc (1) et pour exercer une action de morsure, dans laquelle les parties dentées (116) mordent dans la périphérie du tuyau coudé en caoutchouc (1) dans une condition où elles saisissent ce dernier, les parties dentées (116) des cliquets (112) étant forcées radialement vers l'extérieur contre la force du ressort (117) par le tuyau coudé en caoutchouc (1) lorsque l'élément de préhension (10) avance jusqu'à sa position de préhension, les cliquets (112) étant alors sollicités par les ressorts (117) dans une position de préhension dans laquelle l'extrémité du tuyau coudé en caoutchouc (1) est saisie par les cliquets (112).
  2. Dispositif pour fabriquer un tuyau coudé en caoutchouc selon la revendication 1, caractérisé en ce que chaque cliquet (112) est rotativement supporté par un arbre de support (113) s'étendant dans une direction transversale à l'axe du mandrin (2), et en ce que pour recevoir le tuyau coudé en caoutchouc dans l'élément de préhension, le cercle de face est expansible au moins autant que le diamètre extérieur du tuyau coudé en caoutchouc (1), par rotation de chaque cliquet (112) dans une direction de rétraction de sorte que la partie dentée (116) de celui-ci peut passer au-dessus de la périphérie du tuyau coudé en caoutchouc.
  3. Dispositif pour fabriquer un tuyau coudé en caoutchouc selon la revendication 2, caractérisé en ce que chaque cliquet (112) peut être mis en rotation au moyen d'un ressort (117) dans une direction de morsure de la partie dentée.
  4. Dispositif pour fabriquer un tuyau coudé en caoutchouc selon l'une des revendications 1 à 3, caractérisé en ce qu'un guide d'alignement (125) est disposé près du mandrin (2) du côté de l'élément de préhension (10), et en ce que le guide d'alignement (125) est pourvu d'un alésage de guidage (126) concentrique avec le cercle de face et qui est adapté pour pouvoir être traversé par le tuyau coudé en caoutchouc (1), et d'une surface de guidage (127) inclinée sur la direction d'extraction vers l'alésage de guidage.
EP96200510A 1992-09-29 1993-09-29 Procédé et dispositif pour fabriquer un tuyau coudé en caoutchouc Expired - Lifetime EP0720909B1 (fr)

Applications Claiming Priority (13)

Application Number Priority Date Filing Date Title
JP28371192 1992-09-29
JP283714/92 1992-09-29
JP4283711A JP2775128B2 (ja) 1992-09-29 1992-09-29 ゴム曲り管の製法及びその装置
JP28371292 1992-09-29
JP28371492 1992-09-29
JP28371392 1992-09-29
JP28371392A JP2651978B2 (ja) 1992-09-29 1992-09-29 ゴム曲り管の製造装置
JP283712/92 1992-09-29
JP283711/92 1992-09-29
JP4283714A JP2777621B2 (ja) 1992-09-29 1992-09-29 ゴム曲り管の製法
JP4283712A JP2891597B2 (ja) 1992-09-29 1992-09-29 ゴム曲り管の製造装置
JP283713/92 1992-09-29
EP93307725A EP0595475B1 (fr) 1992-09-29 1993-09-29 Procédé et dispositif pour fabriquer un tuyau coudé en caoutchuoc

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP93307725.7 Division 1993-09-29
EP93307725A Division EP0595475B1 (fr) 1992-09-29 1993-09-29 Procédé et dispositif pour fabriquer un tuyau coudé en caoutchuoc

Publications (3)

Publication Number Publication Date
EP0720909A2 EP0720909A2 (fr) 1996-07-10
EP0720909A3 EP0720909A3 (fr) 1996-07-17
EP0720909B1 true EP0720909B1 (fr) 2002-03-20

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Application Number Title Priority Date Filing Date
EP93307725A Expired - Lifetime EP0595475B1 (fr) 1992-09-29 1993-09-29 Procédé et dispositif pour fabriquer un tuyau coudé en caoutchuoc
EP96200510A Expired - Lifetime EP0720909B1 (fr) 1992-09-29 1993-09-29 Procédé et dispositif pour fabriquer un tuyau coudé en caoutchouc

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EP93307725A Expired - Lifetime EP0595475B1 (fr) 1992-09-29 1993-09-29 Procédé et dispositif pour fabriquer un tuyau coudé en caoutchuoc

Country Status (4)

Country Link
US (1) US5424015A (fr)
EP (2) EP0595475B1 (fr)
AT (1) ATE168069T1 (fr)
DE (2) DE69319540T2 (fr)

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* Cited by examiner, † Cited by third party
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US5765285A (en) * 1995-08-09 1998-06-16 The B.F. Goodrich Company Method of bending a rigid thermoplastic pipe
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US5424015A (en) 1995-06-13
EP0595475A1 (fr) 1994-05-04
DE69331750D1 (de) 2002-04-25
EP0720909A2 (fr) 1996-07-10
DE69319540T2 (de) 1998-10-29
EP0720909A3 (fr) 1996-07-17
EP0595475B1 (fr) 1998-07-08
DE69331750T2 (de) 2002-11-28
ATE168069T1 (de) 1998-07-15
DE69319540D1 (de) 1998-08-13

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